Fix an issue that external protocol in subframes are not handled on Android

chrome/android/javatests/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandlerTest.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.externalnav;
 
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
@@ skipping 1030 matching lines @@
         boolean expectStartActivity = (otherExpectation & START_ACTIVITY) != 0;
         boolean expectSaneIntent = (otherExpectation & INTENT_SANITIZATION_EXCEPTION) == 0;
 
         mDelegate.reset();
 
         ExternalNavigationParams params = new ExternalNavigationParams.Builder(url, isIncognito,
                 referrerUrl, pageTransition, isRedirect == REDIRECT)
                 .setApplicationMustBeInForeground(chromeAppInForegroundRequired)
                 .setRedirectHandler(redirectHandler)
                 .setIsBackgroundTabNavigation(isBackgroundTabNavigation)
+                .setIsMainFrame(true)
                 .build();
         OverrideUrlLoadingResult result = mUrlHandler.shouldOverrideUrlLoading(params);
         boolean startActivityCalled = mDelegate.startActivityIntent != null;
 
         assertEquals(expectedOverrideResult, result);
         assertEquals(expectStartIncognito, mDelegate.startIncognitoIntentCalled);
         assertEquals(expectStartActivity, startActivityCalled);
 
         if (startActivityCalled && expectSaneIntent) {
             checkIntentSanity(mDelegate.startActivityIntent, "Intent");
@@ skipping 32 matching lines @@
             return new TestPackageManager();
         }
 
         @Override
         public String getPackageName() {
             return "test.app.name";
         }
 
     }
 }